/////////////////////////////ATtiny412
//define pins
////// I2C
#define SDA_pin A1 // pin 4
#define SCL_pin A2 // pin 5
////// SERIAL
#define Tx_pin B2
#define Rx_pin B3
////// OUTPUTS
#define LED_Rgb A6 // pin2
#define LED_rGb A7 // pin3
#define LED_rgB A3 // pin7
////// Variables
# define baud_Rate 9600
# define myAddress 1 // add address here
// RGB ARRAYS
int RGB_Array[] = {LED_Rgb, LED_rGb, LED_rgB};
int RGB_ArrayCount = sizeof(RGB_Array) / sizeof(RGB_Array[0]);
// OTHER variables
int myDelay = 100;
//////////////////////////////
//// INCLUDES
#include <Wire.h>
//////////////////////////////

void setup() {
  // put your setup code here, to run once:
  // OUPUTS
  pinMode(LED_Rgb, OUTPUT);
  pinMode(LED_rGb, OUTPUT);
  pinMode(LED_rgB, OUTPUT);
  // COMMS
  RGB_off();// INITIAL STATE
  Wire.begin(myAddress); // join i2c bus with address #4
  Wire.onReceive(receiveEvent); // register event
  // Serial
  Serial.swap(1);// solves single RGB red led problem
  Serial.begin(baud_Rate); // start serial for output
  while (!Serial);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(myDelay);
}
///////////////////////////////////////
void receiveEvent(int howMany) {
  int x = Wire.read();    // receive byte as an integer
  switch (x) {

    case 0:
      // OFF
      RGB_off();
      break;

    case 1:
      // ON
      RGB_on();
      break;

    default:
      RGB_off();
      break;
  }
}
////////////////////
void RGB_off() {
  for (int k = 0; k <= RGB_ArrayCount - 1; k++) {
    digitalWrite(RGB_Array[k], HIGH);
  }
}
///////////////
void RGB_on() {
  // seperately on/off
  for (int k = 0; k <= RGB_ArrayCount - 1; k++) {
    digitalWrite(RGB_Array[k], LOW);
  }
}
///////////////////